Nose tapping test inducing a generalized flexor spasm: a hallmark of hyperexplexia

Area of Science:

• Neurology
• Pediatrics
• Genetics

Background:

• Describes hyperexplexia, a rare benign neonatal disorder.
• Characterized by generalized hypertonicity, brisk reflexes, clonus, and exaggerated startle response.
• Can present as familial or sporadic cases.

Observation:

• Reports on two families with familial hyperexplexia.
• Details a characteristic response to nose tapping: facial twitching, head extension, and flexor spasm.
• Documents varying severity of hyperexplexia among siblings.

Findings:

• Identifies hyperexplexia as a distinct neonatal neurological condition.
• Demonstrates a specific diagnostic reflex (nose tap response).
• Shows that benzodiazepines are effective in treating severe cases.

Implications:

• Awareness of hyperexplexia can prevent unnecessary investigations and treatments.
• Early diagnosis and intervention improve infant outcomes.
• Highlights the importance of recognizing genetic and familial patterns in neonatal disorders.